TEST OF STEEL REINFORCED RECYCLED AGGREGATE CONCRETE AXIAL COMPRESSION SHORT COLUMNS AFTER HIGH TEMPERATURE

In order to reveal the axial compression behavior of steel reinforced recycled aggregate concrete ( SＲＲAC) columns after high temperature，18 specimens were designed for monotonic loading experiment after high temperature， and five varying parameters were considered，which were the high temperature，the constant temperature time，the cover thickness，the steel ratio and the stirrup ratio． The failure processes and forms of specimens at different temperatures were observed，the percentage of mass decrement，load-displacement curves，residual bearing capacity， and other important data were obtained． And the effecting law of each changing parameters on the SＲＲAC columns’ mechanical behavior after high temperature was analyzed． Ｒesults showed that the failure mode of SＲＲAC columns after high temperature was similar to that at normal temperature． The SＲＲAC columns after high temperature had certain deformation performance after ultimate load，but the axial rigidity and residual bearing capacity of specimens were reduced compared with that at normal temperature． The strength of the specimens after high temperature was reduced by 13% to 50%，which was reduced by 32% to 42% at 600 ℃．